Just be naked, same effect, less money in my experience. (Unless you mean like underwear, then unfortunately we're stuck, but everything else, yeah, thrift)
TJ Maxx and similar stores have pretty good prices on basic bras. I got three for $18 like three years ago and I haven't needed any others since.
this is funny but it's definitely not remotely true, imo. There's loads of good retailers out there, from small-time Etsy sellers to full-on brands. Goodonyou is a great (albeit, not exhaustive) directory for sustainable fashion brands.
The downside, of course, is that they're often more expensive.
That's all on them. Woman are embarrassed to wear the same dress at different events, so they mostly buy another dress.
You can see why that's not sustainable so they are all made cheap for second class and expensive for the elite. Market is just suppling the demand.